This is a good example, I think, of how data visualization helps you make sense of things: Even simple things like a small table of data. In this case, the table is from The College Board, showing changes in the percentage of in-state freshmen in our nation's public universities. You can see the raw data by downloading Table 28, here . What you can't see by looking at that table, of course, is the overall pattern. That's where a picture comes in. T here are only tw o numeric values in the table: Percentage of freshman enrollment that are state residents in 2002 and 2012. I added a third, by subtracting one from the other. Then I put them on a choropleth hex map, a format I like because all the states are the same size. On this map, orange colors show states where the percentage of in-state residents has increased; purple shows a decrease, and grays are mostly even. Be careful about interpreting this data. This visualization ...